More renumbering
This commit is contained in:
Crista Lopes
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Style #33
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==============================
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REST = REpresentational State Transfer (http://www.ics.uci.edu/~fielding/pubs/dissertation/top.htm)
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REST is a style for network-based interactive applications that
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underlies the Web. The example here doesn't go over the network, but
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preserves the main contraints of REST, which are:
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- Interactive: end-to-end between an active agent (e.g. a person) and a backend
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- Separation between Client (user interface) and Server (data storage)
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- Statelessness, as in client--stateless-server: every request from
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client to server must contain all the information necessary for the
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server to serve the request. The server cannot store
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context of the interaction. Session state is on the client.
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- Uniform interface: resources that are created and retrieved,
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resource identifiers and hypermedia representation that is the
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engine of application state
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Additionally, the networked style has the following contraints, not shown here:
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- Cache
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- Layered system
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- Code-on-demand
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Possible names:
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- RESTful
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- Stateless Ping-Pong
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@@ -1,27 +0,0 @@
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@@ -1,111 +0,0 @@
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#!/usr/bin/env python
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import re, string, sys
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with open("../stop_words.txt") as f:
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stops = set(f.read().split(",") + list(string.ascii_lowercase))
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# The "database"
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data = {}
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# Internal functions of the "server"-side application
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def error_state():
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return "Something wrong", ["get", "default", None]
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# The "server"-side application handlers
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def quit_handler(args):
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sys.exit("Goodbye cruel world...")
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def default_get_handler(args):
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rep = "What would you like to do?"
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rep += "\n1 - Quit" + "\n2 - Upload file"
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links = {"1" : ["post", "execution", None], "2" : ["get", "file_form", None]}
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return rep, links
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def upload_get_handler(args):
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return "Name of file to upload?", ["post", "file"]
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def upload_post_handler(args):
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def create_data(filename):
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if filename in data:
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return
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word_freqs = {}
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print "Trying to open " + filename
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with open(filename) as f:
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for w in [x.lower() for x in re.split("[^a-zA-Z]+", f.read()) if len(x) > 0 and x.lower() not in stops]:
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word_freqs[w] = word_freqs.get(w, 0) + 1
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word_freqsl = word_freqs.items()
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word_freqsl.sort(lambda x, y: cmp(y[1], x[1]))
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data[filename] = word_freqsl
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if args == None:
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return error_state()
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filename = args[0]
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try:
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create_data(filename)
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except:
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return error_state()
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return word_get_handler([filename, 0])
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def word_get_handler(args):
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def get_word(filename, word_index):
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if word_index < len(data[filename]):
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return data[filename][word_index]
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else:
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return ("no more words", 0)
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filename = args[0]; word_index = args[1]
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word_info = get_word(filename, word_index)
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rep = '\n#{0}: {1} - {2}'.format(word_index+1, word_info[0], word_info[1])
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rep += "\n\nWhat would you like to do next?"
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rep += "\n1 - Quit" + "\n2 - Upload file"
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rep += "\n3 - See next most-frequently occurring word"
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links = {"1" : ["post", "execution", None],
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"2" : ["get", "file_form", None],
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"3" : ["get", "word", [filename, word_index+1]]}
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return rep, links
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# Handler registration
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handlers = {"post_execution" : quit_handler,
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"get_default" : default_get_handler,
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"get_file_form" : upload_get_handler,
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"post_file" : upload_post_handler,
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"get_word" : word_get_handler }
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# The "server" core
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def handle_request(verb, uri, args):
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def handler_key(verb, uri):
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return verb + "_" + uri
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if handler_key(verb, uri) in handlers:
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return handlers[handler_key(verb, uri)](args)
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else:
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return handlers[handler_key("get", "default")](args)
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# A very simple client "browser"
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def render_and_get_input(state_representation, links):
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print state_representation
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sys.stdout.flush()
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if type(links) is dict: # many possible next states
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input = sys.stdin.readline().strip()
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if input in links:
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return links[input]
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else:
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return ["get", "default", None]
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elif type(links) is list: # only one possible next state
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if links[0] == "post": # get "form" data
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input = sys.stdin.readline().strip()
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links.append([input]) # add the data at the end
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return links
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else: # get action, don't get user input
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return links
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else:
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return ["get", "default", None]
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request = ["get", "default", None]
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while True:
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# "server"-side computation
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state_representation, links = handle_request(*request)
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# "client"-side computation
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request = render_and_get_input(state_representation, links)
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